Downloaded Firefox browser on new HP Pavilion dv6. After a couple of days, Firefox icon changes to default Windows program icon. Uninstalled Firefox and re-installed. After a few days, the icon changed back to default Windows program icon. I cannot manually change icon back under Properties setting as default program icon is now associated with Firefox program. Laptop is 64-bit, and program is installed under Windows x86 folder. Is this a Microsoft setting issue? Or do I need a different download for 64-bit?